tri.c

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define SIZE 10

void find_min(double tab[], int i0, int *ind, double *min) {
    *min = tab[i0];
    *ind = i0;
    for (int i = i0 + 1; i < SIZE; ++i) {
        if (*min > tab[i]) {
            *ind = i;
            *min = tab[i];
        }
    }
}

int main() {
    srand(time(NULL));
    double tab[SIZE];
    for (int i = 0; i < SIZE; ++i) {
        tab[i] = rand() / (double)RAND_MAX;
    }

    for (int i = 0; i < SIZE - 1; ++i) {
        double min  = tab[i];
        int ind_min = i;
        find_min(tab, i, &ind_min, &min);
        double tmp   = tab[i];
        tab[i]       = min;
        tab[ind_min] = tmp;
    }

    for (int i = 0; i < SIZE; ++i) {
        printf("%f ", tab[i]);
    }
    printf("\n");
}